Errors when setting a previously uploaded image as avatar

Steps to reproduce

1. Go to user's profile page
2. Click "Change photo" button
3. Browse and select a first image
4. Click "Upload and select" button
5. Click "Change photo" button again
6. Browse and select another (second) image
7. Click "Upload and select" button
8. Click "Change photo" button again
9. Click "Select" (green check) button for the first uploaded image

Expected results

The first image uploaded is set as avatar (may require a page refresh to be seen).

Actual results

The first image cannot be set as avatar at this point.

A red error message is displayed on the bottom of the page:

Failed:Server not responding

In browser's JS console, the following errors are displayed:

prototype.js?r=1:1739   POST http://localhost:1115/xwiki/bin/view/XWiki/undefined 404 (Not Found)
request @ prototype.js?r=1:1739
initialize @ prototype.js?r=1:1704
(anonymous) @ prototype.js?r=1:447
klass @ prototype.js?r=1:80
onSelect @ AttachmentSelector:227
(anonymous) @ prototype.js?r=1:417
(anonymous) @ prototype.js?r=1:7266

and

prototype.js?r=1:1837 Uncaught TypeError: Cannot read properties of undefined (reading 'match')
    at klass.isSameOrigin (prototype.js?r=1:1837:22)
    at klass.respondToReadyState (prototype.js?r=1:1819:43)
    at klass.onStateChange (prototype.js?r=1:1754:12)
isSameOrigin @ prototype.js?r=1:1837
respondToReadyState @ prototype.js?r=1:1819
onStateChange @ prototype.js?r=1:1754
XMLHttpRequest.send
request @ prototype.js?r=1:1739
initialize @ prototype.js?r=1:1704
(anonymous) @ prototype.js?r=1:447
klass @ prototype.js?r=1:80
onSelect @ AttachmentSelector:227
(anonymous) @ prototype.js?r=1:417
(anonymous) @ prototype.js?r=1:7266

The issue also reproduces if the user goes back to change any other picture from existing ones.

The issue couldn't be reproduced on XWiki 17.6.0.